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St George's Vascular Institute Protocol: An Accurate and Reproducible Methodology to Enable Comprehensive Characterization of Infrarenal Abdominal Aortic Aneurysm Morphology in Clinical and Research Applications
Faculty
Not Specified
Year:
2012
Type of Publication:
Article
Pages:
400-414
Authors:
Ghatwary, Tamer, Karthikesalingam, Alan, Patterson, Benjamin, Hinchliffe, Robert, Morgan, Robert, Loftus, Ian, Salem, Ayman, Thompson, Matt M, Holt, Peter J
Journal:
JOURNAL OF ENDOVASCULAR THERAPY ALLIANCE COMMUNICATIONS GROUP DIVISION ALLEN PRESS
Volume:
19
Research Area:
Surgery; Cardiovascular System \& Cardiology
ISSN
ISI:000306347600018
Keywords :
abdominal aortic aneurysm, endovascular aneurysm repair, 3D imaging, computed tomographic angiography, morphological assessment, dimensions, aortic neck, aneurysm sac, access vessels, common iliac arteries, calcification, observer variability, tortuosity
Abstract:
Purpose: To define the reproducibility of a protocol for the analysis of infrarenal abdominal aortic aneurysm (AAA) morphology for clinical and research purposes. Methods: A protocol for the comprehensive assessment of preoperative AAA morphology based on formal systematic review and expert opinion featured 114 morphological parameters (maximum and minimum diameters, cross-sectional areas, vessel lengths, volumes, angulation, and calcification and tortuosity indices) in each of 3 regions: the neck, sac, and access vessels. To validate the protocol, 4 observers measured these variables on the preoperative computed tomographic angiograms from 50 patients (45 men; mean age 75 years, range 52-89) scheduled for endovascular aneurysm repair using software for 3-dimensional image reconstruction. One observer performed repeated measurements. The intra- and interobserver variabilities were calculated for all parameters; measurement time for all 114 features was recorded. Results: Aortoiliac diameter, length, volume, area, and tortuosity index measurements showed good inter/intraobserver agreement. Aortic neck and aortoiliac angle measurements displayed high intra/interobserver repeatability coefficients (28\%-43\% and 29\%-61\%, respectively). Calcification measurements had the highest variability within and between observers: 39\%-65\% and 44\%-96\%, respectively. The measurement protocol was completed in a mean 105 minutes (range 55-420). Conclusion: Accurate 3-dimensional analysis of AAA morphology can be performed reliably within a reasonable time. Measurements that relied on consistent anatomical landmarks were most reproducible. Assessment of angulation and calcification required a number of subjective judgments, increasing the potential for variation. Automated methods are likely to be more suitable for certain measurements. J Endovasc Ther. 2012;19:400-414
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